surgery vs amastia

surgery and amastia both are nouns.

Word	Noun	Adjective	Verb	Adverb
surgery	Yes	No	No	No
amastia	Yes	No	No	No

surgery (noun)	amastia (noun)
a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body	absence of the mammary glands (either through surgery or developmental defect)
a room in a hospital equipped for the performance of surgical operations
a room where a doctor or dentist can be consulted
the branch of medical science that treats disease or injury by operative procedures